To achieve ideal results in a GCxGC analysis, it is imperative that your primary and secondary columns feature orthogonal phases capable of producing differing separations. Use the chart below to find the perfect combination of Restek columns to maximize the effectiveness of your GCxGC system.
| Application Area | Primary Column | Secondary Column | ||
| Phase | Selectivity | Phase | Selectivity | |
| Petrochemical | Rxi-1ms | Nonpolar | Rxi-17Sil MS | Midpolar, aromatic selective |
| Petrochemical | Rxi-5Sil MS | Low polarity | Rxi-17Sil MS | Midpolar, aromatic selective |
| PAHs, environmental | Rxi-17Sil MS | Midpolar, aromatic selective | Rxi-1ms | Nonpolar |
| PAHs, environmental | Rxi-17Sil MS | Midpolar, aromatic selective | Rxi-5Sil MS | Low polarity |
| PCBs, PBDEs, PAHs, environmental | Rxi-XLB | Low polarity, planar selective | Rxi-17Sil MS | Midpolar, aromatic selective |
| Mono-ortho, coplanar PCBs | Rxi-1ms | Nonpolar | Rxi-XLB | Low polarity, Planar selective |
| Mono-ortho, coplanar PCBs | Rxi-5Sil MS | Low polarity | Rxi-XLB | Low polarity, Planar selective |
| Pesticides, nitroaromatics, halogenated compounds | Rxi-1ms | Nonpolar | Rtx-200 | Midpolar, electronegative selectivity |
| Pesticides, nitroaromatics, halogenated compounds | Rxi-5Sil MS | Low polarity | Rtx-200 | Midpolar, electronegative selectivity |
| Pesticides, nitroaromatics, halogenated compounds | Rxi-XLB | Low polarity, planar selective | Rtx-200 | Midpolar, electronegative selectivity |
| Flavors, fragrances | Rxi-1ms | Nonpolar | Stabilwax | Polar |
| Flavors, fragrances | Rxi-5Sil MS | Low polarity | Stabilwax | Polar |
| Flavors, fragrances | Stabilwax | Polar | Rxi-1ms | Nonpolar |
| Flavors, fragrances | Stabilwax | Polar | Rxi-5Sil MS | Low polarity |
